div{
    width: 90%;
    height: 90%;
}
.header{
    width: 100%;
    height: 50px;
    border: 1px solid #000;
}
.logo-img{
    width: 10%;
    height: 100%;
    float: left;
}
.menu-div{
    width: 80%;
    float: right;
    height: 100%;
    text-align: center;
}
.menu-div ul{
    width: 80%;
    height: 100%;
    list-style: none;
    padding: 0;
    margin: 0;
}
.menu-div ul li{
    width: 33%;
    height: 100%;
    float: left;
    display: flex;
    justify-content: center;
}
.menu-div ul li a{
    width: 100%;
    height: 100%;
    font-size: 30px;
    text-decoration: none;
    color: #000;
    display: block;
}
.main-div{
    width: 100%;
    height: 70%;
    margin: 0 auto;
    border: 1px solid #000;
    text-align: center;
}
.main-div .from-div{
    width: 100%;
    height: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.main-div table{
    width: 100%;
    height: 19%;
}
.main-div table tr td{
    width: 19%;
    height: 100%;
}
.nav-container{
    display: flex;
    justify-content: center;
}
.container{
    display: flex;
    justify-content: center;
    align-items: center;
}
form{
    border: 1px solid #456;
    text-align: center;
    width: 80%;
}
input{
    width: 60%;
    height: 10%;
    margin: 10px;
}
table{
    margin: auto;
    width: 80%;
}
table, th, td {
    border: 1px solid black;
    text-align: center;
}
th a,td a{
    text-decoration: none;
    color: black;
}
canvas {
    display: block;
    margin: auto;
    border: 1px solid #000;
}
.game-container {
    width: 90%;
    height: 90%;
    margin: auto;
}

.row{
    width: 96%;
    height: 24%;
}
.cell {
    width: 24%;
    height: 99%;
    float: left;
    border: 1px solid #BBB;
}